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      First Evidence of the Pig-nosed Turtle (Carettochelys insculpta) Vocalizing Underwater

      , , ,
      Copeia
      American Society of Ichthyologists and Herpetologists (ASIH)

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          Turtle vocalizations as the first evidence of posthatching parental care in chelonians.

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            Characterizing the graded structure of false killer whale (Pseudorca crassidens) vocalizations.

            The vocalizations from two, captive false killer whales (Pseudorca crassidens) were analyzed. The structure of the vocalizations was best modeled as lying along a continuum with trains of discrete, exponentially damped sinusoidal pulses at one end and continuous sinusoidal signals at the other end. Pulse trains were graded as a function of the interval between pulses where the minimum interval between pulses could be zero milliseconds. The transition from a pulse train with no inter-pulse interval to a whistle could be modeled by gradations in the degree of damping. There were many examples of vocalizations that were gradually modulated from pulse trains to whistles. There were also vocalizations that showed rapid shifts in signal type--for example, switching immediately from a whistle to a pulse train. These data have implications when considering both the possible function(s) of the vocalizations and the potential sound production mechanism(s). A short-time duty cycle measure was developed to characterize the graded structure of the vocalizations. A random sample of 500 vocalizations was characterized by combining the duty cycle measure with peak frequency measurements. The analysis method proved to be an effective metric for describing the graded structure of false killer whale vocalizations.
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              Voice of the turtle: The underwater acoustic repertoire of the long-necked freshwater turtle,Chelodina oblonga

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                Author and article information

                Journal
                Copeia
                Copeia
                American Society of Ichthyologists and Herpetologists (ASIH)
                0045-8511
                1938-5110
                March 10 2017
                March 10 2017
                : 105
                : 1
                : 29-32
                Article
                10.1643/CE-16-407
                43bbda0c-ebe4-4ad9-8fda-a9f2a47347c3
                © 2017

                http://www.bioone.org/page/resources/researchers/rights_and_permissions

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